Adjustable tapered wrist-pin for cross-heads



(No Model.)

T. L. RUSSELL.

ADJUSTABLE TAPERED WRIST PIN FOR GROSSHEADS.

No. 385,526 Patented July 3, 1888.

mto'amm s,

NTTED STATES Parent thrice.

THEODORE LEANDER RUSSELL, OF NEAI-t EMLENTON, PENNSYLVANIA.

ADJUSTABLE TAPERED WRIST-=PIN FOR CROSS HEADS.

SPECIFICATION forming part of Letters Patent No. 385,526, dated July" 3,1888.

Serial No. 259,391. No model.)

To all whom it may concern.-

Be it known that I, THEODORE Lnannnn RUssEILL, residing near Emlcnton,Vcnango county, Pennsylvania, have invented a new and ImprovedAdjustable Tapered \Nrist-Pin for the Oross'Heads of Locomotives andother Engines, of which the following is a specification.

Ordinarily in locomotives and engines of a similar character thepiston-rod is connected to a sliding cross head, to which theconnecting-rod is pivotally connected. The crosshcad straddles the endof the connecting-rod, which embraces a wrist-pin which is usually castor otherwise integrally formed with the cross-head. The result is thatwith this con struction all of the wear upon the wrist-pin takes placeat two points-where it receives the thrust of the connecting-rod and onthe opposite side therefrom.

The main object of this invention is to sub stitute for the fixedwrist-pin an improved adjustable tapered wristpin which can be easilyand readily rotated in the cross-head, so as to present all portions ofits periphery to the wear of the connecting-rod and without disturbingthe boxes of the connccting'rod which iuclose the wrist'pin.

The invention further comprises mechanism for rotating the wrist'pin afixed distance, and also a nut-locking device for the nuts which retainthe wristpin in place.

The invention is illustrated in the accompanying drawings, in which--Figure 1 is a front view of across-head provided with the improvedwrist-pin. Fig. 2 is a plan, partly in section, of the same. Figs. 3 andit are side views looking,respectivcly,in the directions indicated bythe arrows 3 and 4 in Fig. 2.

A is the crosshead, and B the pistonrod, the crosshead being formed soas to slide in the usual guides. The crosshead is somewhat thicker (orhigher) than usual, so as to admit of its being bored crosswise to formthe bear-- ings for the wrist-pin shaft. The wrist-pin shaft, which ispreferably of cast-steel, is comprised of a cylindrical portion, 0,which extends across the open slot to in the crosshead, and which isembraced by the connecting-rod, and which constitutes the wrist-pinproper. On each side of this cylindrical portion are tapered sections DE, each at its point ofjunction with the cylindrical part 0 being of agreater diameter than the part 0, so that shoulders I) b are formed. Thetapered sections 1) E are preferably continuations or frustums of thesame cone, and the bore in the cross-head is tapered to receive them.The wrist-pin shaft extends on each side beyond the tapered portions,and the sections F G on either side are screw-threaded. Thescrewthreaded section F, adjacent the tapered section D, having thelarger diameter, carries a 1oosening-nut,II, and the otherscrew-threaded section, G, carries a tightening-nut, I, and a janrnut,J. W'hen the wrist-pin shaft is first placed in position and theconnccti ng-rod con nected to it, the tightening-nut I is forced tightlyagainst the cross-head, thus wedging the tapered sections D E into theirconical seats and holding the wrist-pin shaft immovablyin position.Thejam-nut J is then turned tightly against the nut I, looking the samein place. WVhen, however, the wearing-surfaces of the wrist-pin becomeworn and it is desirable to turn the shaft so as to bring other parts ofthe wrist-pin into position to receive the wear, the nuts I J areloosened. The loosening-nut H is then turned up against the crosshead,and rotation of it when in contact with the cross-head forces thetapered sections away from their seats. The shaft may then be turned.The inner end of the shaft is contracted and is formed with a smoothcylindrical portion, L, which constitutes a wrist-pin for acoupling-rod, M, which is connected so as to operate the feed-waterpump. This rod is held on the shaft, by means of a nut, N, fitting on anouter screw-threaded portion, 0.

In order to facilitate the turning of thewrist pin shaft, and to enableit to be turned a certain and properdistancc, so that when the wrist-pinbecomes worn a fresh unworn portion may be presented for wear, the outerend of the shaft has a tapered squared end, K. This end is polygonal insection, but is prefcrably square, though not necessarily so, and theshaft may he turned by any wrench which fits on said. end. In order,however, that the shaft may be turned only when desired, and that whenso turned it may be turned through a given are, the end of the shaft isembraced by a polygonal tapered aperture, 0, in a stay,

1?, which is secured to the cross-head by a screw, Q. The aperture 0 islocated in an outwardly-bent portion, R, of the stay, which is thus bentso as not to interfere with the turning of the loosening-nut H. When thesquared end K of the shaft is thus held in the squared aperture 0 of thestay, the slight longitudinal movement of the shaft necessary to loosenthe same is not interfered with; but the shaft can-- not be rotateduntil the stay is removed. It is usually desired to rotate the stay aquarter ofa revolution each time; hence the end K and aperture 0 areusually square. To rotate the shaft this distance, the screw Q isremoved and the stay taken off and again inserted on the squared end, sothat it stands perpendicular to the cross-head instead of parallelthereto, as usual. The stay is then turned down to its normal horizontalposition and secured, thus turning the shaft just ninety degrees. \Vhenthe shaft has been tightened in place, it is very desirable that thetighteningnut I and jam-nut J should be locked, so as not to beaccidentally turned. These nuts are preferably octagonal. To lock thesame a nut-locking bar, S, is provided having an open recessed face, T,conforming to three sides of the octagonal nuts. iVhen thenuts are inplace, the recessed face of the bar is brought to abut against the nuts,and the bar is held in position by a screw, U, passing through alongitudinalslot, d, in the bar and entering the cross-head. WVhen it isdesired to turn the nuts, the screw is simply loosened and the barslipped back, so that the nuts may be free from the recessed face. Toprevent the nutlocking bar from turning on the scre\v,the bar hasagroove, e, on its inner face,which fits over a feather or projectiomf,on the cross-head.

I claim as my invention- 1 l. A. cross-head for locomotives and otherengines having conical apertures extending laterally therethrough, andan adjustable wrist-pin shaft having conical sections which fit in saidapertures,said shaft being extended on either side of the cross-head andscrewthreaded, in combination with tightening and loosening nuts fittingon said shaft and seating against opposite sides of the crosshcad,substantially as set forth.

2. A cross-head for locomotives and other engines and an adjustablewrist pin shaft mounted therein, having a polygonal end, in combinationwith a stay removably secured to the cross-head, having a polygonalaperture which fits over said polygonal end, substantially as set forth.

3. A cross-head for locomotives and other engines, an adjustablewristpin shaft mounted therein, and a tightening nut or nuts for saidshaft, in combination with a nut-locking bar secured to saidcross-head,which abuts against said nut or nuts, substantially as setforth.

4:. A cross-head for locomotives and other engines, an adjustablewrist-pin shaft mounted 6 therein, and a tightening nut or nuts for saidshaft, in combination with a nut-locking bar having a recessed facewhich abuts against said nut or nuts, substantially as set forth.

In witness whereof I have hereunto signed 70 my name in the presence oftwo subscribing witnesses.

TlllEOllORE L ll ANDE it RUSSELL.

\Vi tn esses:

E. B. SIIEFFER, Soorr J AMISON.

